Pump.



W. S. SUTTON.

.PUMP.

Patented Feb. 18, 1918.

UNITED STATES PATENT OFFICE.

WILLIAM s. so'r'rotu, or ROCKFORD, ILLINOIS, ASSIGNOR TO AMERICANRADIATOR COMPANY, OF CHICAGO. ILLINOIS. A CORPORATION OF NEW JERSEY.

PUMP. v

To all whom-itpiay-coacem Be it known that I', WILLLUfSf'SUTTON,

a citizen of'ithe United States, residing at Rockford, in; 'thef-"eountyof Winnebago,

State of -Illinois; have invented certain new and useful fl-lmproyements m Pumps, of

' whichthe'following isa specification.

3 M'y invention relates in general .to' pumps,

, v but lnorevparticularly to'airpumpsused n j-yacuunr cleaningapparatus? where. the air lfdrawn in pump-r 4-. i

' The-inventionj'is', particularlydirected to within a ca'sing'likeiatwotooth gear-to propasses through the air pump and if there are; 1ahy'forkaignsubstances ofany body drawn 1 reaching the air pump,considerable-injury isdone tattle-impellers, or other-parts of thevpum'v T a. One othe objects of my inventionis tow surfacethe impellers usedin air pumps w th a soft metal, such a s'-lead,"to lessen vibration tothe 'appar atusv-passes through the the impellers erbladesof the pump.

,- In, an. air pump of well-known construc tion" there areftwo,impellers which revolve an'd continuous suction. lonot touch each otherat dime. a Qijiositiv'e' These impellers,

any'point but their adjustment has. to be extremely-fine Thedust-laden'airdrawn into the pipes of the vacuum apparatus into theIapparatu'sand not removed before and-to provide-a surface 'that may beeasily machined,-1-but I'ha'\ 'e"found that Where the surfaces of, bothimpellers a re"for1 ned ..of meta-l of;thesame-degreeof hardnessl t re;

sults'f -iif lthe stripping; or tearing of such meta'1- fromtheimpellersWhen some foreign substance drawn through thepipes is caughtbetweenjthemj' This is due to the fact that;

the two'metals' are ofthe same degree of hardness and the foreignsubstance will first tear a piece of metal from one impeller whichwillginjurethe other impeller, resulting in therolling up" of-a ball orstripof:

metal, a ortion; of which isv collected from each impeller and thustnotonlydestroymg the efficiency of the machine, but frequently resulting inits breaking. I

It is-to overcome this disadvantage toimpellers-: composed of materialof the same hardness that my invention is further dirooted. It is alsodesirable to surface the impellers-with material that will not rust,since water is frequently introduced into the pump and by using a softmetal, or a metal Specification of Letterslatent, lh tcnied FebApplication filed March 7, 1912. Serial No 2240.

- at least softer than the core of the impellers, the noise from theoperation of the pump is considerably lessened.

is a top view of my improved pump with the [casing broken away: Fig. 2is a section on the line 2-2 of Fig. l.

inferring now more particularly to the drawing, the pump consists ofacasing 3 having an inlet. port 4 and an outlet port Mounted within thecasing are shafts 6 and '7 having suitable hearings 8 and upon which arekeyed the impellers 9' and 10. A gear ll is 'mou'nted upon each shaft,and said gears arein' mesh so that both shafts may be driven by a singledrive-shaft 12.

in the'accompanying drawing, Figure l" I'claim nothing new in thegeneral pump constructionsince it is the'connnon form of rotarypump ofthe cycloidal type in which the impellers 9 and 10 revolve like atwotooth gear withingthe casing 3 producing a epositive'and' continuoussuction at the intake opening 4.

I, v Que feature of my invention resides in the construction of theimpellers, the body pored or otherwise secured the surface material ofdifferent degress of hardness.

-VVhere the surfaces of the two impellers "are composed of soft metal ofthe same degree of hardness; a foreignsubstance with any bodywhatsoever, after being partially embedded in one impeller, will injurethe t) and 10, which are composed of metals '80 tions of which are madeof cast iron orany other suitable material, over which is moldsurface oftheother impeller and if the maistics, and while I do not limit myselfto any particular material, I preferably surface one impeller withcommon Babbitt metal and the other impeller with type metal, preferablyof low grade, both of which substances have b 7 low elastic eglualitiesand are of different degrees of bar ness, and neither of these metalswill rust. The result of such a construction 1( is this: that when aforeign substance with any body is caught between the impellers, theforeign substance will be either embedded in the surface of theimpellerhaving the softer material thereon and such foreign substance Willeither remain in the surface of the impeller 0r be throWn therefrom, butin no, event Will material from one impeller be transferred and adhereto the other oneand thus pass back and forth particles of metal so as toresult in the stripping-or ribboning of the metal surfaces from eitheror both impellers. p

I do not Wish it to be understood that I am limited to the particularmetals herein designated; since it is obvious that other metals might beused having substantially the same characteristics Without departingfrom" the spirit of myinven'tion, nor am I limited to the particularmeans for 00313111};

the impellers, such as by molding the surface metals thereon, and,

Therefore, Without confining inyself to the details herein specified, Iclaim:

1. A pump having impellers the air impelling surfaces of which arecomposed of metal of 10W elastic characteristics and of diiferentdegrees of hardness. i

' 2. A pump having impellers, the air impelling surfaces of Which arecomposed of metallow in elastic characteristicsand'unequally yieldableto the same pressure.

WVILLIAM S. SUTTON.

VVit-nesses:

l 'ROBERT LATHROI,

LoUIsn LAWRENCE.

